Oh no, not greece... Sorry emma, but their modern pronunciation of ancient Greek is going to sound very unfamiliar and strange to most people who study anceint greek outside of greece. You know those "baba" sheep people who insist on pronouncing beta with a B sound. Why can't these greeks fess up to their self denial?

m and p are quite similar indeed, in that they are both labial.
m induces the vibration of vocal chord and makes p a vocal, to say, b.

Similarly D sound is written [face=SPIonic]nt[/face], and hard G is written [face=SPIonic]gk[/face]([face=SPIonic]g[/face] before [face=SPIonic]k[/face] is sounded ng)

If you are a Tolkien fan, see how the tengwars for Quenya mp() and nd() are used for b and d, respectively in the Beleriandic mode. http://www.geocities.com/tengwar2001/ --> see "Tengwar Textbook - 4th Edition"